When designing fire alarm systems, the highest possible enhancement of life safety is provided by a Category L1 system. In a Category L1 fire system, all areas of the building are protected by automatic fire detection. In rooms or areas in which there
is a need for automatic fire detection of fire in order to protect the occupants of these rooms or areas, smoke or combustion gas detectors need to be provided. In other rooms, heat detectors might be acceptable.
An L1 fire alarm system might be appropriate in buildings in which there is a significant number of occupants at special risk
in the event of fire (e.g. hospitals and certain residential care premises), or in which, throughout the building, structural fire precautions are not of as high a standard as normally specified for buildings of that type.
A Category M fire alarm system, in which there is no automatic fire detection system, is only likely to suffice if no one
sleeps in the building and fire is likely to be detected by people before smoke seriously reduces visibility in the escape routes.
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